A-3.6 EGD Sweep Impact for Embedded Ethernet Interface on
RX3i & RSTi-EP CPE Models
6.4.2.1.2 EGD Sweep Impact for RX3i CPE330 and CPE400/CPL410
The CPE330 and CPE400 process Ethernet communications independently from logic and sweep execution.
This architecture precludes the possibility of Ethernet communications causing the watchdog timer to time
out. Consequently, the discussion below does not apply to CPE330 or CPE400.
6.4.2.1.3 EGD Sweep Impact for RX3i CPE302/CPE305/CPE310 and RSTi-EP
CPE100/CPE115 Embedded Ethernet Interface
Each EGD production or consumption will take about 200 µs regardless of size of exchange. For Produced
Exchanges on the embedded port you can think of it as a timed interrupt block that takes 200µs duration to
execute each time it is triggered. For Consumed Exchanges on the embedded port you can think of it as an
I/O interrupt block that takes 200µs duration to execute each time the remote unit sends an exchange and it
is received on the embedded port.
It is important to note that this 200µs per exchange is not a simple ‘sweep impact’ time, rather per execution
of that exchange time, and depending on sweep time length and production period it may occur more than
one time per sweep.
Users configuring systems with EGD on an embedded Ethernet port should take care to make sure that
production and consumption time on the embedded Ethernet port is accounted for.
The impact of EGD Exchanges configured on Embedded Ethernet Interface of RX3i CPE302/CPE305/CPE310
and RSTi-EP CPE100/CPE115 on the Controller sweep can be reflected in two parameters:
1. : This is the total EGD impact per Watchdog Time period
configured in milliseconds (ms).
2. : This is the percentage EGD processor utilization.
The formula for calculating these two parameters are shown below:
– Watchdog time configured in ms
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